0.5 to 10 MN/m²
1 to 15 MN/m²
2.5 to 15 MN/m²
3.5 to 20 MN/m²
D. 3.5 to 20 MN/m²
Longitudinally
Circumferentially
On dished end
Anywhere
Vb = 0.5 V cosα
Vb = V cos α
Vb = 0.5 V² cosα
Vb = V² cosα
Low
Very low
High
Very high
260 kW
282 kW
296 kW
302 kW
Higher calorific value at constant volume
Lower calorific value at constant volume
Higher calorific value at constant pressure
Lower calorific value at constant pressure
Isothermal
Isentropic
Hyperbolic
Polytropic
0.2
0.8
1.0
0.6
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing,
Heat is transferred by bleeding some gases from furnace
10 to 15 %
15 to 25 %
25 to 40 %
40 to 60 %
Last superheater or reheater and air preheater
Induced draft fan and forced draft fan
Air preheater and chimney
None of the above
Increases
Decreases
Remains constant
None of these
Equal to
Less than
Higher than
None of these
1.5 to 2 m
2.5 to 3.5 m
3.5 to 4.5 m
None of these
150 kg/h
210 kg/h
280 kg/h
340 kg/h
21 %
23 %
30 %
40 %
To draw water
To circulate water
To drain off the water
All of these
Heat transfer takes place across cylinder walls
Work is done
Steam may be wet, dry or superheated after expansion
All of the above
1.05
2.86
6.65
10.05
Economiser
Superheater
Both (A) and (B)
None of these
Entropy
Enthalpy
Pressure
Temperature
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Increase the temperature of saturated steam without raising its pressure
To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work
To exhaust steam from the cylinder at proper moment
373°K
273.16°K
303°K
0°K
Wet
Superheated
Remain dry saturated
Dry
The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The amount of water evaporated from and at 100°C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100°C
When the cross-section of the nozzle increases continuously from entrance to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
None of the above
Approach temperature should be as low as possible
Handling and maintenance should be easier
Heat transfer area should be optimum
Stack gases should not be cooled to the dew point
Convection
Radiation
Conduction
Radiation and conduction
1 to 2 m
1.25 to 2.25 m
1.5 to 2.5 m
1.75 to 2.75 m
One-half
One-third
Two-fourth
Two-fifth